Support of DWARF V2

Change code to support DWARF Version 2 (Microchip AVR8 tool chains)
Change comment to indicate changes between V2 and V3.
Verify the code to ensure it is compliant to support DWARF v2 and DWARF v3.

Author: dupont-al-videotron-ca

src/LibObjectFile.CodeGen/dwarf.h

@@ -338,7 +338,7 @@ extern "C" {
 #define DW_AT_associated                        0x4f /* DWARF3 */
 #define DW_AT_data_location                     0x50 /* DWARF3 */
 #define DW_AT_byte_stride                       0x51 /* DWARF3f */
-#define DW_AT_stride                            0x51 /* DWARF3 (do not use) */
+#define DW_AT_stride                            0x51 /* DWARF2 (do not use) */
 #define DW_AT_entry_pc                          0x52 /* DWARF3 */
 #define DW_AT_use_UTF8                          0x53 /* DWARF3 */
 #define DW_AT_extension                         0x54 /* DWARF3 */

src/LibObjectFile/Dwarf/DwarfUnit.cs

@@ -171,7 +171,7 @@ public override void Read(DwarfReader reader)
 
         DwarfUnitKindEx unitKind = reader.DefaultUnitKind;
 
-        if (version <= 2 || version > 5)
+        if (version < 2 || version > 5)
         {
             reader.Diagnostics.Error(DiagnosticId.DWARF_ERR_VersionNotSupported, $"Version {version} is not supported");
             return null;

src/LibObjectFile/generated/LibObjectFile.Dwarf.generated.cs

@@ -759,7 +759,7 @@ public static unsafe partial class DwarfNative
         public const ushort DW_AT_byte_stride = 81;
 
         /// <summary>
-        /// DWARF3 (do not use)
+        /// DWARF2 (do not use)
         /// </summary>
         public const ushort DW_AT_stride = 81;
 
@@ -4183,9 +4183,15 @@ public enum DwarfAttributeKind : ushort
         ReturnAddr = DwarfNative.DW_AT_return_addr,
 
         StartScope = DwarfNative.DW_AT_start_scope,
-        
+
+        /// <summary>
+        /// DWARF3 name
+        /// </summary>
         BitStride = DwarfNative.DW_AT_bit_stride,
-        
+
+        /// <summary>
+        /// DWARF2 name
+        /// </summary>
         StrideSize = DwarfNative.DW_AT_stride_size,
 
         UpperBound = DwarfNative.DW_AT_upper_bound,
@@ -4253,9 +4259,15 @@ public enum DwarfAttributeKind : ushort
         Associated = DwarfNative.DW_AT_associated,
 
         DataLocation = DwarfNative.DW_AT_data_location,
-        
+
+        /// <summary>
+        /// DWARF3f
+        /// </summary>
         ByteStride = DwarfNative.DW_AT_byte_stride,
-        
+
+        /// <summary>
+        /// DWARF2
+        /// </summary>
         Stride = DwarfNative.DW_AT_stride,
 
         EntryPC = DwarfNative.DW_AT_entry_pc,